Other receivables, net (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Unrelated Parties [Member]
Other receivables	$ 1,057	[1]	$ 905	[1]
Less: allowance for doubtful accounts	(55)		(56)
Other Receivables Net Noncurrent	1,002		849
Related Party [Member]
Other receivables	691	[1]	715	[1]
Less: allowance for doubtful accounts	(611)		(608)
Other Receivables Net Noncurrent	$ 80		$ 107

[1] Other receivables consist of amounts advanced to both related and unrelated parties, primarily as unsecured demand loans, with no stated interest rate or due date. These receivables originate as part of the Company's normal operating activities and are periodically settled in cash.